This book is Copyright (C) 1999-2015 David A. Wheeler.
Permission is granted to copy, distribute and/or modify
this book under the terms of the GNU Free Documentation License (GFDL),
Version 1.1 or any later version published by the Free Software Foundation;
with the invariant sections being “About the Author”,
with no Front-Cover Texts, and no Back-Cover texts.
A copy of the license is included in the section entitled
“GNU Free Documentation License”.
This book is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
The image of the Sallet (ca. 1450)
is provided by the Walters Art Museum in Baltimore, Maryland, at
http://art.thewalters.org/detail/40677/sallet/.